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<h1>Selection Mode</h1>
<p>Selection Mode is a device that modifies the behavior of <a href="rotationtool.html">Rotation Tool</a>, <a href="reflectiontool.html">Reflection Tool</a> and <a href="cuttingtool.html">Cutting Tool</a>, by restricting these operations to a small part of the origami. It can be used for separating one layer of paper from the rest, and folding only that layer.
<p>Selection Mode can be activated by clicking the <img src="selectionmode/08.png"/> button (if it isn't switched on yet) and then clicking somewhere in the <a href="creasepattern.html">Crease Pattern</a>. The point you clicked on will be indicated by a small red cross on the paper that also appears in the <a href="3dview.html">3D View</a>.
<p>When you use the <a href="ruler.html">Ruler</a> in Selection Mode, the next fold will be restricted to the area that contains the red cross and is bounded by the red lines in the Crease Pattern. For example, in the picture below, this area is marked with yellow:
<center><img src="selectionmode/09.png" width="60%" ></center>

<h2>Exercise</h2>
This exercise will demonstrate the difference between a normal fold and a fold made with the Selection Tool.
<ol>
<li>Go to <b>File > New > Square origami</b> to start with a fresh piece of paper.</li>
<li>Fold the paper in half using Reflection Fold (or a 180&deg; Rotation Fold).
<center><img src="selectionmode/01.png" width="60%" ></center></li>
<li>Fold the paper in half again, but this time, with only a 90&deg; Rotation Fold:
<center><img src="selectionmode/02.png" width="60%" ></center>
<center><img src="selectionmode/03.png" width="60%" ></center></li>
<li>As you can see, Rotation Fold has folded both layers of the paper by 90&deg;. This is how an unrestricted Rotation Fold works.
<center><img src="selectionmode/04.png" width="60%" ></center></li>
<li>Click <b>Edit > Undo</b>, and <b>left click</b> on the 3D View once to return to front view. Place the Ruler the same way as in Step 3, but this time, do not click on the popup menu. Instead, go over to the Crease Pattern, and select a point at the right end of the paper:
<center><img src="selectionmode/05.png" width="60%" ></center>
The little red cross indicates that Selection Mode is active and the next folding action will be restricted to the area containing the red cross and bounded by the red line.
</li>
<li>Now <b>right click</b> on the 3D View, select <b>Rotate</b>, and set the angle to 90&deg;.
<center><img src="selectionmode/06.png" width="60%" ></center></li>
<li>This time, Rotation Tool has folded only one layer of the paper.
<center><img src="selectionmode/07.png" width="60%" ></center></li>
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